¶ How to wire Tesla Model S/X batteries to a CellMate K9
Tesla Model S/X modules can be reasonably easily wired to CellMate K9s for conversion to home storage or use in a custom EV. Care is needed when wiring to ensure all voltages can be measured by the K9.
¶ 12S Configuration (Recommended)
¶ 6S Configuration
¶ How do I wire up two Tesla modules to a TestMon and then WatchMonPlus (WM5)?
These are legacy products and no longer recommended
If you only have 24v, then this will never suit WM5 and needs to be WM7.
¶ Comparison with older cell monitors
| CellMate K9 | WatchMonPlus WM5 | WatchMonPlus WM7 | MultiMon MM8 | |
|---|---|---|---|---|
| No. of Cells | 3-16s | 10-15s | 6-10s | 10-15s |
| Temperature Sensors | 4 | 3 | 2 | 3 |
| Communication | Serial | CANbus | CANbus | CANbus |
| Limitations of Wiring | Cells need to increase in voltage as cell number increases | Jumpers need to be in certain locations to specify no. of cells | Jumpers need to be in certain locations to specify no. of cells | Jumpers need to be in certain locations to specify no. of cells |
| Cells attached must belong to the same bank | Cells attached must belong to the same bank | Cells attached must belong to the same bank | Cells attached must belong to the same bank | |
| High voltage | Yes, just add more K9 | Yes add MM8 | Use K9 or WM5 instead | Yes add more MM8 |
| Works with WMC | Yes | No | No | Yes |
Single banks or parts of banks where high voltage can be attached to the CellMate-K9. If 24V multi-string, you would need one CellMate-K9 per bank.
But for 48V you can connect two 6s Tesla modules to a CellMate-K9 to make 48V. With CellMate-K9 jumpers added to channels that aren't being used but voltage needs to increase as channel number increases from 1 to 16.